T-rest for lathes.



H. J. HJORTH. T-EEST FOR LATHES.

APPLICATION FILED MAY 31, 1913.

Patented Feb: 9, 1915.

'He NORRIS PETERS 20.. PHDTOVLITHO. WASHINGTON. D. C.

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Specification of Letters Tatent.

Panama Feb. 9, i915.

Application filed my 31, 1918. serial in. 771,931.

To aZZ whom it may concern Be it known that LITENRICK J. HJonTH, a citizen of the United States, residing at VVoburn, in the county of Middlesex and State of lllassachusetts, have invented certain new and useful Improvements in T- Rests for Lathes, of which the following is a specification.

The presentinvention relates to animprovement in T-rests for bench lathes having for its primary object to locate the clamp which secures the rest in such a position that it will not interfere with the hand or tool of the operator in any position of the rest.

Another object is to provide an improved mode of mounting the post or holder for the T-rest so that it may be swung forwardly and downwardly out of the way.

The preferred manner in which these and other objects ofmy invention are carried into efiect is illustrated in the accompanying drawings, wherein, I

Figure 1 represents a partial elevation of a bench lathe having applied thereto a T-rest made in accordance with myinvention and exemplifying the preferred form thereof. Fig. 2 is a longitudinal section of the rest on an enlarged scale, showing also in dotted line'sthe position of the rest when swung downwardly out of the way. Fig. 3 is an elevation of the rest as seen from the right of Fig. 2. Fig. l is a plan View of the slide and holder on which the rest is mounted. Fig. 5 is an elevation in detail of the post on which the rest is mounted and the lock for retaining such post in an upright position.

' The same reference characters indicate the same parts in all the figures- The rest which forms thesubject of the present invention is designed to be, used in the manner usual with devices of this sort in connection with a small lathe for guiding a hand tool, and as the rest itself and the devices with which it is directly engaged and by which itisheld; form the ,sole subject of the invention, .1. have not shown, except conventionally, the lathe to which the rest is applied, or the mode of mounting the rest on the bed onways of the lathe. As to the latter, it is suflicient to say that in Fig. l the head stock of a lathe is represented by 1; the tail stock by 2, the bed by 3 and a carriageor block on which the T-rest is mounted by 4. The rest itself is mounted upon a slide 5 which has an undercut groove 6 in its under side to receive the head ofa stud by which it is clamped in place. Rising from the slide is a post 7 on which the rest 8 is mounted.

The manner of mounting the rest is the first novel feature of the invention. All T-rests of which I have knowledge made prior tomy invention have been provided with a shank which is inserted and held in a tubular socket, such socket being split so that the shank of the rest may be adjusted vertically, and having a clamp for closing the socket. upon the shank and so securing the/rest in its "various adjustments. This mode of fastening the rest has been objectionable because of the fact that the clamp interferes, with the hand of the workman, or with the tool which he holds when the rest is at the lowest of its adjustments. The primary object of the present invention is to avoid this result-by making the rest of such a character that the clamp is always ata suflicient distance below its guiding edgeas not to interfere with the operators hands or the tool," whatever may be the position of the rest. Accordingly I provide as the element which directly engages and holds the, rest, post 7 while the rest itself is provided with a sleeve portion 9 sure rounding and-embracing the post. This sleeve is slotted or split at 10 and has at or near its lower end lugs 11, 12 through which passes a. clamping screw 13. The clamping screw is threaded into one of the lugs and passes freely throughthe other, having a collar. 14 which bears on said other lug.- It is provided withan offset. handle 15 by which it may be turned to secure the rest. The amount of vertical adjustment permitted to the rest is limited by the amount of penetration of the post 7 in the sleeve 10 and may be as great as the range of adjustment of the old type ofT-rest. However, since the clamp, with its offset handle and projecting lugs, is-at the lower end of the sleeve 10, which sleeve is integral withor othewise permanently united to the rest, the projecting parts of the clamp are at a uniform distance from the guiding edge 16 of the rest, so that no matter whether the rest is at the highest point of its adjustment, or at the lowest. point, the clamp is always so far below the guiding edge as not to interfere with the tool or the workmans hand.

U The rest is also mounted so that it may swing away from the work, and for that purpose is pivoted on an axis parallel to and below that of the work. The post 7 has a lug 17 lying between two lugs 18 on the tront end of the slide 5 and pivotally retained by a pin 19. Thus the post and with it the rest may be placed in the operati've position shown in Figs. 1, 2 and 3, or it may be swung to an inoperative position indicated by the dotted lines in Fig. 2. For holding the post and rest in the upright operative position, I provide locking devices consisting of a block 20 secured to the slide 5 and a ring 21 mounted upon the post. The block has a tongue or finger 22 projecting toward the post, and the ring is partly cut away so as to leave a flange 28 shown best in Fig. 5, which is movable to underlie the finger 22. The ring is still further cut away at the end of the flange 23 to provide a clearance space 24: through which the finger 22 passes when the post is brought into or out of position for looking.

The ring is mounted upon the post in a manner which permits it to turn freely through a limited angle, but positively prevents its displacement longitudinally of the post. For thus holding the ring I provide a flange 25, preferably formed integral with the post, on which the ring rests, and a collar or sleeve 26 surrounding the post and having a flange 27 overlying the ring to a greater or less extent. This collar 26 is secured in a sufficiently firm manner to'the post as by having a driving fit thereon, and it may be additionally secured by a set screw 28. This set screw passes through the ring and collar and bears against the post. It also serves as a stop for limiting the amount of angular movement of the ring, since it may be given such a length as to project to some extent through a slot 29 in the ring, as shown in Fig. 5. The ends of this slot, by striking the set screw, arrest the movement thereof in either direction, as will be readily seen.

When the rest is to be brought from the inoperative to the operative position, the ring is so placed that the clearance space 24 is opposite to finger 22, since, when the ring is in this position. the rest can be brought into upright position without interference with the locking finger. After being brought into such position, the movement in this direction being limited by the flange 25 coming into contact with the surface of the slide 5, the ring 21 is turned slightly to the right, whereupon'the lip or flange 23 is brought under the finger 22 and the rest is secured upright.

I claim- 1. The combination of a T-rest having a longitudinally split sleeve in permanent connection therewith, a post surrounded by said sleeve and with respect to which the rest and sleeve are vertically adjustable, and a clamp mounted upon the lower end of the sleeve for binding the same upon the post.

2. In a lathe, a tool rest, a holder therefor with respect to which the rest is vertically adjustable, and a clamping device for securing the rest in any position upon the holder, said clamping device being at the same distance below the guiding edge of the rest in all positions of the latter.

3. In a lathe, a tool rest having a guiding edge, an upright post for supporting the rest, a sleeve surrounding the post, upon the upper end of which sleeve the rest is permanently secured, said sleeve being movable telescopically along the post so as to adjust the height of the rest, and a clamp secured upon the lower end of the sleeve for locking the same in various positions upon the post, and being thereby sufliciently far below the guiding edge of the rest to be clear of the tool and hand of the workman when the rest is lowered as well as when it is raised.

4. In a lathe, a tool rest, a holder for the rest, a slide to which said holder is pivoted in a manner permitting movement of the holder and rest away from the work, and

complemental locking devices mounted on p the holder and slide respectively for securing the holder and rest in their operative position nearest to the work.

5. In combination with a lathe and a'tool rest pivotally mounted so that it may swing toward and from the work, a means for locking the rest in its operative position, comprising a stationary locking tongue and a ring carried with the rest and movable laterally, said ring having a flange or rib adapted to pass under the tongue and by engagement therewith to secure the rest in its operative position.

6. In combination with a lathe, a tool rest slide, a tool rest-holder pivotally con- Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

